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nature : the temperature has exceeded the time corresponding to the pressure and still boiling point of liquid to boiling. As pure liquid reached the boiling point when it formed the first bubble, then its radius inevitable small, foam saturated vapor pressure within inevitable far less than external pressure. Consequently oppression under pressure, difficult to form small bubbles, which is not easy boiling liquid, thus becoming overheated liquid. Where overheated liquid state is not a state of equilibrium which is metastable state. When the temperature overheating or more once mixed with air bubbles and impurities, prone to violent boiling phenomena. Before heating the liquid Add zeolite can be avoided sharp boil, because zeolite has a radius of the larger bubbles exist when the temperature reached the boiling point, with its saturated vapor pressure and external pressure can be very close to or equal.
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